Drum washing machine



FIG. 1 is a front, right perspective view of the drum washing machine showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is left side view thereof, the right side view being a mirror image thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a drum washing machine, as shown and described. 